Question 1

How do hybrid cars achieve better efficiency?

Accepted Answer

Hybrids use electric motor at low speeds (most efficient for gas engines), regenerative braking captures energy, engine shuts off at stops, and battery assists during acceleration reducing engine load.

Question 2

What is the difference between hybrid types?

Accepted Answer

Mild hybrid: small battery assists engine, cant drive electric-only. Full hybrid: can drive short distances on electric. Plug-in hybrid (PHEV): larger battery, 20-50 miles electric range, then uses gas.

Question 3

Why does the US use MPG while others use L/100km?

Accepted Answer

MPG (higher = better) is intuitive for comparing. L/100km (lower = better) better shows fuel savings - halving consumption halves L/100km but doesn't double MPG.

Question 4

How does speed affect fuel economy?

Accepted Answer

Most vehicles are most efficient at 45-65 mph. Above 65 mph, every 5 mph increase is like paying an extra $0.20-0.30 per gallon.

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